diff --git a/server/cmd/migrate/migration/version-local/1789400000000_image_search_collection.go b/server/cmd/migrate/migration/version-local/1789400000000_image_search_collection.go
index b1fdc13..d637399 100644
--- a/server/cmd/migrate/migration/version-local/1789400000000_image_search_collection.go
+++ b/server/cmd/migrate/migration/version-local/1789400000000_image_search_collection.go
@@ -3,7 +3,6 @@ package version_local
 import (
 	"runtime"
 
-	goautomigrations "go-admin/app/goauto/migrations"
 	"go-admin/cmd/migrate/migration"
 	common "go-admin/common/models"
 	"gorm.io/gorm"
@@ -17,13 +16,11 @@ func init() {
 // #278 permits image-search tasks while preserving existing task rows.
 func migrateImageSearchCollection(db *gorm.DB, version string) error {
 	return db.Transaction(func(tx *gorm.DB) error {
-		if err := goautomigrations.Migrate(tx); err != nil {
-			return err
-		}
 		if tx.Dialector.Name() == "mysql" {
-			if err := tx.Exec("ALTER TABLE collection_task DROP CHECK ck_collection_task_source").Error; err != nil {
-				return err
-			}
+			// MySQL does not support ALTER CHECK in place.  The migration runner
+			// records this version once, so dropping/recreating the named check is
+			// deterministic and does not trigger a whole-schema AutoMigrate.
+			_ = tx.Exec("ALTER TABLE collection_task DROP CHECK ck_collection_task_source").Error
 			if err := tx.Exec("ALTER TABLE collection_task ADD CONSTRAINT ck_collection_task_source CHECK (source IN ('admin','agent_current_page','image_search'))").Error; err != nil {
 				return err
 			}